Apparatus for underground pumping



P. LOUBET;-

APPARATUS FOR UNDERGROUND PUMPING.

APPLICATION FILED IuLI 20,1920.

Pafoentedl De. 27, 1921. y

Ynvemlor.

PIERRE LOUBET, or PARIS, ERANoE, AssIGNoR 'ro SOCIETE: HUE FRERES Er nopnnrr, v or PARIS, FRANCE. a rRENcn conronnrroiv.

APPARATUS. Eon uNDEReRoUivn Poitrine.

Specication of Letters Patent. Patented D630.; 2f?, 1921.k

y Application leduly 20, 1920.' Serial No. 397,744. y

(GRANTED UNnER TEE rRovrsIoNsor THE Aer or Manen s, 1921, 41 sur. L., 1313.) Y

To alli/whom it 'may concern: Y

Be it known that I, PIERRE LOUBET, citizen of the French Republic, residing at Paris, Department of the Seine, in France, (and having I. O. address 12 Rue Victor Duruy, in the said cty,) have invented certain new and useful Im rovements in Apparatus for Underground umping, (for which I have filed application for Letters Patent in France September 21, 1917, Patent No. 486,897, May 15, 1918,) and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention has for its objectl to effect improvements `in pumps and consists in an addition to the latter of a tube having a strainer which is situated some meters below the stratum of water and is surrounded by a cylindrical layer of Loire sand which has been carefully washed, the object being to insure a constant supply from any underground water stratum, even when the pumping is interrupted, and also to purify the water and render it potable.

The invention is described herewith in detail with reference to the accompanying drawing which shows diagrammatically by way of example one form of construction of the pumping and filtering apparatus.

Figure 1 is a vertical section showing an auxiliary pump pipe installation below the water stratum.

' Fig. 2 is a section on a large scale of a part of the two cylinders of the strainer.

The pump tube 1, provided with a nonreturn valve 2 located under the pump and vabove the level of the water stratum 3, has

attached to it a tube 4 which is sunk into the ground vertically to a certain vdepth below the water stratum. This tube 4, up to a certain distance above its lower end which is closed, is provided on its surface with` holes 5 the total area of which is at least equal to that of the section of the tube. The

tube 4 also has attached to it by means of a stufling box 6 a double strainer or superimposed sleeves perforated along their entire surface with very ine holes on the outer sleeve 7 and with somewhat larger holes on the inner sleeve 8. The strainer is likewise inclosed at its lower end.

In the boring made in the ground 9 a Around the strainer and above it at 12 Loire Y sand which has been carefully washed is placed. Another layer of charcoal 13 is placed on it and above this a layerfof sand 14 up to the ordinary level of the water stratum, the upper part of the well shaft 15 being finally lled up with earth up to the non-return valve.

It is understood that the filtering layers of charcoalor any other appropriate material are only employed when the water is impure and it is desired to render it t for consumption while in ordinary cases it suffices to ill the boring containing the pipe and the strainers with Loire sand. i

The object of this arrangement is to secure a constant supply from an underground water stratum by means of apump,l forv which the apparatus described forms an indispensable addition. n

If'for example the water stratum becomes exhausted at a certain moment, the apparatus nevertheless continues to operate in consequence of the large reserve column of water which, while it is being pumped out, permits the Water stratum to regain its level.

Further, the lsuction effect of the apparatus `layer of charcoal, and a top fillingof sand,

a strainer embedded in said lower Vportion of sand comprising inner and outer perforated shells, an outlet or suction pipe eX- tending downwardly through said shaft or bore and into said strainer and'perforations in the lower end of said pipe. 2.l In a sunken well shaft or bore having its major portion extending below the water strata, the combination with a pump, of a' ltering means comprising an outside shell of charcoal positioned in said major portion, a supply of sand lling substantially the lower pant oli said. shell, an intermediate layer of charcoal, and a top iilling of sand, at strainer embedded in' Said ylower -portion comprising inneil and outer peroi-atedshells, an outlet or suction pipe extending down Wardly through the inajon'portion 'of Said shaft on bore and into said strainer and peiomtions in the lowei'lend of said pipe.

3. ln a sunken well `shaft or bore having its maj or portion extending below the Water strate and having its portion above saidwater strata substantially closed, the Combination WitlixaJ pump, of a porous filtering memomen dium positioned in said major portion, a stiainei embedded in seid filtering medium attfthelowei end et Seidinujei portion-,rand an outlet or suction pipe extending doWnf wardly through the closed upper end, and also thi'oughthe niajoi" portion of said shaft or bore, and into said strainer. Y

ln testimony whereof ll a-X my signature, in presence of :t Witness.

- PERRE LOUBET.y

lWitness CLEMENT S. EDWARD. 

